Ok guys,here is a small guide about how works the diamond inserting thingie.

Firstly,get a diamond.Second,choose the equip you want to strenghten.

NOTE:If an item increases 2 stats,a distribution will be made.An example,you add a Red Diamond +14 to Masked Suit.The suit will have 11+7 SPD and 5+7 SPD.The last step would be to compound the diamond and the item wanted.

Watch out for the equip to don't break.You will loose the diamond.Same thing with bomb diamonds but instead any item is a weapon.

If you want to take out the diamond just use the Tear Pliers.It will take out crit\diamondd out of it and give you back the diamond.